> If a = b, then:
> a^2 = a*b
> a^2 - b^2 = (a*b) - b^2
> (a-b)(a+b) = b(a - b)
> (a+b) = b
> Substitute the original a = b into the equation:
> 2b = b
> 2 = 1

http://members.cox.net/mathmistakes/

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